my penis is not full hard aftar rubbing.

hi, my problem is i am doing mastarbation. but last 15 days i stop. i afraid. last 3-4 month when i mastarbate that time i rub my penis continiue and imegine my gf . i **** her. and continue rub penis , before when i rub penis my penis so quickly and hard, but this time the problem is when i rub my penis. the penis is not too hard and take a long time then hard for a short time. again very fast relife then quite. this is my problem. also my spurm also very low quantity.but the main is why my penis take time before hardness.this is good or any serious problem. i am going for married next 2 month. please anybody give me suggestion. what i do. thanks

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